运动性疲劳的细胞机制及研究进展   总被引：18，自引：0，他引：18  

侯春丽  闫守扶  孙红梅 《首都体育学院学报》2003,15(1):89-92

运动性疲劳是一个十分复杂的过程，并受到多种因素的影响，迄今为止人们对其产生的机理仍未达成一致的看法。本文就运动性疲劳的机制问题对近几年来研究的热点及最新进展情况试作阐述。  相似文献   

谈对位联防的集优防守特征   总被引：1，自引：0，他引：1  

赵军 《体育科学研究》2002,6(2):79-80

随着篮球进攻技术的提高，战术的完善，规则的不断修改，对防守技、战术的要求越来越高，就对位联防战术的针对性、综合性、攻击性特点，探讨在篮球比赛实战中的应用。  相似文献   

中国摔跤队参加第18届亚洲男子自由式摔跤锦标赛技术统计与分析   总被引：1，自引：0，他引：1  

张豪杰 《山东体育学院学报》2006,22(5):78-79

1前言第18届亚洲男子自由式摔跤锦标赛于以刃5年5月26日一刀日在湖北武汉举行，来自亚洲巧个国家和地区的84名运动员参赛，经过两天的激烈比赛，决出7个级别前八名和团体前3名。中国队派出7名队员参赛，最终获得第l名、第2名、第3名、第5名和第8名各l名，团体第8名。笔者对此次  相似文献   

现代战争与格斗术教学训练改革   总被引：2，自引：1，他引：1  

朱昆宏  刘顺义 《军事体育进修学院学报》2002,21(1):107-109

针对目前部队格斗术教学中存在的一些问题，阐述了格斗术教学训练改革应着眼于现代战争的需要，从提高官兵的实战技能入手，强化对抗性练习，加强心理训练与理论创新，抓好教员骨干队伍建设的思路。  相似文献   

一氧化氮与运动疲劳关系的研究进展   总被引：5，自引：0，他引：5  

熊正英  曲洪刚 《福建体育科技》2004,23(2):17-19

一氧化氮(NO)是一种自由基,也是一种重要的细胞内信使分子,其参与许多生理过程,具有广泛的生物学效应。本文主要从NO对肌肉的外周机制和大脑的中枢机制两方面对运动性疲劳进行阐述,探讨了NO与运动性中枢疲劳的关系,并展望了其在消除运动性疲劳的意义。  相似文献   

网络环境信息标引的测评与比较研究   总被引：1，自引：1，他引：0  

刘竟  朱书梅  侯汉清 《中国图书馆学报》2008,34(1)

网络环境下,文献信息具有数量多、增长快、新词层出不穷等特点。标引是对信息资源进行组织的有效手段和重要环节,标引的质量和效率直接影响信息组织的质量和速度。对受控标引、自由标引和自动标引三种标引方式进行了相符度、专指度、标引深度及通用词数的测试对比.得出自由标引优于受控标引,自动标引优于自由标引及受控标引的结论。  相似文献   

我国公共文化场馆免费开放政策检视与反思     

陈庚  白昊卉 《中国图书馆学报》2018,44(3):52-65

以公共图书馆为例,运用文化权利、政策过程理论对我国公共文化场馆免费开放展开政策检视和反思。研究发现,免费开放政策取得重要成效,但亦存在问题:恒定的经费补贴量难以满足免费开放后文化供给量和服务量的增长;经费分担机制未完全落实;按行政层级设计的补贴标准难以关照到不同规模的公共图书馆需要;监督管理和考核评价机制缺失,政策激励约束不足。这主要是因为动态的政策调整和优化未能及时跟进,中央地方事权与支出责任划分不明确、支出责任与财力不匹配以及政策成本高于收益。因此,建议完善分类资助标准,设计多重综合标准;建立完善经费保障的动态调整机制,创新财政保障方式;建立绩效评价体系,形成激励约束机制。表2。参考文献27。  相似文献   

The effects of attentional focus instructions on punching velocity and impact forces among trained combat athletes     

Israel Halperin  Dale W. Chapman  David T. Martin  Chris Abbiss 《Journal of sports sciences》2017,35(5):500-507

Research indicates that instructing athlete’s to focus on bodily movements (internal focus of attention [IFA]) may hinder performance, whereas instructing them to focus on the movement outcome (external focus of attention [EFA]) often enhances performance. Despite the importance of instructions in striking combat sports, limited research has examined the influence of IFA and EFA on performance in well-trained combat athletes. This study investigated the effects of different instructional cues on punching velocity (m · s^?1) and normalised impact forces (N · kg^?1) among intermediate (n = 8) and expert (n = 7) competitive boxers and kickboxers. Athletes completed three rounds of 12 maximal effort punches delivered to a punching integrator on three separate days. Day one was a familiarisation session with only control instructions provided. In the following two days athletes randomly received IFA, EFA or control instructions prior to each of the three rounds. Athletes punching with EFA were 4% faster and 5% more forceful than IFA (P < 0.05), and 2% faster and 3% more forceful than control (P < 0.05). Furthermore, experts punched 11% faster and with 13% greater force compared with intermediate athletes (P < 0.05). EFA led to a positive effect on punching performance and should be favoured over IFA and control instructions.  相似文献   

False-performance feedback does not affect punching forces and pacing of elite boxers     

Israel Halperin  Dale W. Chapman  Kevin G. Thompson  Chris Abbiss 《Journal of sports sciences》2019,37(1):59-66

Prior research indicates that providing participants with positive augmented feedback tends to enhance motor learning and performance, whereas the opposite occurs with negative feedback. However, the majority of studies were conducted with untrained participants performing unfamiliar motor tasks and so it remains unclear if elite athletes completing familiar tasks respond in a similar fashion. Thus, this study investigated the effects of three different versions of false-performance feedback on punching force (N), pacing (force over time) and ratings of perceived exertion (RPE) in 15 elite amateur male boxers. Athletes completed a simulated boxing bout consisting of three rounds with 84 maximal effort punches delivered to a punching integrator on four separate days. Day one was a familiarisation session in which no feedback was provided. In the following three days athletes randomly received false-positive, false-negative and false-neutral feedback on their punching performance between each round. No statistical or meaningful differences were observed in punching forces, pacing or RPE between conditions (P > 0.05; ≤ 2%). These null results could stem from the elite status of the athletes involved, the focus on performance rather than learning, or they may indicate that false feedback has a less potent effect on performance than previously thought.  相似文献   

S7-200 PLC与计算机的通信     

胡汉辉 《九江职业技术学院学报》2004,(2):36-38

PLC与计算机结合起来．可充分利用PLC的优良控制性能和计算机的友好人机界面、数据管理能力，组成高性价比的控制系统。本文介绍通过PLC自由口方式实现与计算机的串口通信。  相似文献